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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad2cb52b7d98adb3547456568258dc8180fb3ec3a5047122b871aa9f9f82e47' 
  AND token = '9Rod9qAmrLMKrR3l+ZqLnaIrkS7RCs8hBoIdY9hnj5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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