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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e040db3ecce70f9dccfb8cc30266dbbc5cc4eac98178ac8cc1d1c47ba2cfb7c' 
  AND token = 'KIZtahGsnZND0I6L8Oui0EfWsdV0YL4oFZK5LMboVfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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