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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c030eb28bf0848ecfb192094f133be4d3e0cfa5e787b1b08e86d4fe1fc94d9' 
  AND token = 'nW4+48WbZz5hbhwovNltHXws++OMVTYl411ZZA0T2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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