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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47833b53a1ea09a7aa7df38cd81fcfa35795e658ad9f7917361fb43df413a408' 
  AND token = 'zf0dx7Jr7D2BAwEsPBqPEgab65QIFgccTT+T0Yitnyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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