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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d5b69494f1f9996c968e876b8fa0afa65ce223acb7291857bb2ad6e1619ae1' 
  AND token = 'gu5yoJvVx0gSDwe58u8FKf+MzFvMPHYtxeWH1BaifCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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