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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8f849d04ef9960be17941799c5a6df4e3acc9108ce6659339f3510f133b77f' 
  AND token = 'sXY5dl8eXn5RQslwHonuKRalrwY2uZ4I1MBx7ZucFNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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