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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604a01846e0111fd7a68a9fa7809557b0de571e6e2d5c82bb03fc8a7c0134dd3' 
  AND token = 'ztL1aDwIIm6m68fJxzRIcDRChSFOgMf4WGgy3/JrG0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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