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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1af789d76fe38519ff72cf7b48d99c8cf7d90ef1717df7b6b7fd661a6c348c' 
  AND token = 'E+szBD27Z+IvUuddrxWfAXHzxagp2Zx7JvpJIwJPW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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