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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb385342c8b00b82f28584108af088076a4b0917e2dcf3bd053b282c33a3fff' 
  AND token = 'TqnonIJhx9fRXZgZVcQlTYW9yXMmqvcuSaTiiy7HBsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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