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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e331b9d6a0f55dbaa6433d19cc6406b8aef703529bef6f1f0cd1ce3ea7956fe0' 
  AND token = 'GpgOCO/gQRbqA8Ja8s3qx/O6eTpviYR/wjDyTZ0KIYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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