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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeef8eb35e203bf283ef440aa8f6ea33a60ee7582671a6a4f815f9e3e89d64f4' 
  AND token = 'nPES101oLnPYlftbVKe9bYvL3lPkYGL5E96AH2RK9XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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