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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b11a870a676bae3b55a8083e9ef529c5f9b0caaa0a58aadc986f69eaba5fd87' 
  AND token = '8+wC+XW4YxuEKNeUaHXjDQKJesvyCftwlUyMNU1ErLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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