SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f85611084e8e7073be8ae7d1dfad1e7f26c17e5193183571d900d2dd9cbaefa' 
  AND token = 'mYDXwx8J5HvasqLOuFVMpLRKGKfT320d/CQZJ7z4bhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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