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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0ed8ed73198c9ebee68c79cf15871d2920c5cd9dfbb1e10928d3a38f43012c' 
  AND token = 'B7fnrddPzW46mpjzpUCamjZHrySfvVxR0IeNHJsW4II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}