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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359c557e606a582d45602dc485fd44c32eaa197e686c0dc4d967d8fe393c1108' 
  AND token = 'v0VG9Vxf5wAh32SokvKsEwvb1JkO6wE9gCBuhRgyz98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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