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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea97897c30e64171398e6aac2c487a5965463dd298b2b561b86b7b1b51088ddf' 
  AND token = 'nYcFtjjXb53G5T7dMP2D5OtRoC2iOCLOgql7QbAopQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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