SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed762b06e9e745fc093be75ac16484af655c1f7130981b30ed16cffb053d4d6' 
  AND token = 'rPe82a/DK+Kzg9SGNjBdRrOkat7yc/LUgEJpZQqjW3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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