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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c872cb6e250ce5d4eea0e9eb84c204fc12cc7f2181cf0c0c10c446657d387b7' 
  AND token = 'jaeD5OVewbBIn/goYGLrtQj1mVc3z5HMqw3LbGQQu+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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