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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2336facb6dd836f0051183ad036797c0d7ef7425018252aeaad7780d81138f12' 
  AND token = 'caabWqDn6tG/W4d2YeaXKy2PuSeD6HeSm++HcRFBsVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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