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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994377c82e5c352200bcc80afa1efab20aa7a57ffdce8103ff6ac7914115f848' 
  AND token = '94wmU4B5aUhIEj2YkRJHPHR28qI6ErBEJJA3wPgjdf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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