SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14672ea1594f1b336a31a42c2c4c70070c8ca8fe01709d35d95f095b2bbd1da1' 
  AND token = '+XspkD+cT2JqzDUXOM0q5vIhYofq7XYRHNVIFEEgJ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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