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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d8b6d8f4fa78be1f3010f825c54526729be29db903830fc4bc23936f68f540' 
  AND token = '05RVqTcUlm4Fi4FldaQz9JsbwPf8niYrYPYDL3VOChU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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