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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fb432c7b06864f4bcdf8965ed863ca955d0cef2abf27ce13b8ef64bd40627c' 
  AND token = '2mrUO6dA6Q4RfjwWJGDw65JMkFqZsP3iIvM9L7c9+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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