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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1460b5501dcf632b011c000e661f70ad89e671c1dc55b76ef047a49914c29443' 
  AND token = 'MrPcFNawTbhmE+95WgrXxb7BSu6Smgu0DRJgCeeut5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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