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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf209cf0121bb16c10294a45f165aceb22e2a8c506c66c0cbcbd26ec6ec36ed' 
  AND token = 'CFzLKuiWWO5lj2TqEV1sYRpbCUzo6T01n59gwxpieNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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