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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c126cb07585ddeb7b17b9f4610a20e39fca419b17662991394403793eec455' 
  AND token = 'Zrq5U9fsqPhiOYx3gV59v5qvo72q02cXosyNKQagtcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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