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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65f29599fc043328c4a8ba99e7d8cfde84e7590358bbaf6a14d76061672a4ec' 
  AND token = 'QNIKpZUmehh5YhQrLp2ex0tXff410HgQ/rvb80ahwlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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