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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa6551728a0d0e5b2bab94b588335b93aff0aa42561331e5cb4492d5ab63696' 
  AND token = 'ekaNl7XxJTTRUBau3arynRTfBSD/sbHsMaEj738PCK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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