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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5b565e0ececf5580533730f4d16e69bc29f5b6a86d9b4e467b8b9e3cbd5ac1' 
  AND token = 'PvJ4MjDjGHX9gDDecJWXsOopDxQNBWvMnekxXN807e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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