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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93665fdcae9b8554d6f20574478173d92b236405681ad52023db577a9a9b1b6' 
  AND token = 'SLQSwteLA2qbwpHlwseL+zlXv2kntsqvtGNgUgi1Xl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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