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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4c31732ebe21f73c0cf0b8f1d1a50c554898a9c6075506d2c33adced2fade6' 
  AND token = 'DJlP70n+q/omNLFPgWhNstA38RnaflKg5i2B1QsbYaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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