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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7625f592b1c9261d7c63d62edd6db9cbc4450c0776f86b6e7455a4a472a431b' 
  AND token = 'v3UVDKLlk2DFGu3lUloX/3xvR0po9JmOpG9frkEuPGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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