Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18ead3281891cb7d4b1d18e895770179ccb9364a9f684bffec0d0562df348dc' 
  AND token = 'aL3JwPtuWXW57qBnvEluHU9bra+mBtrZHRftA1783aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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