SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ab48010a684237bb3fddb1720e38c55366fadfdd145676bb6ada06053986cc' 
  AND token = 'Y9bJDDgmvaU0zyrS4PBVdY3JuKvzZQdGQlqg2Gv7lCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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