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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cfe80a3f575655fe974815cf0d247e8cb12bcc82d5809be32d99b8ec12aeeb' 
  AND token = 'AQRlwV+c+dkkuHWlPdsmftO0Kl5/2efyDpQLC66r1Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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