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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974395f23a1db5b18dfeaca6961cb313428a5469c86ca6019f3eceb8693b9e74' 
  AND token = 'UiMR8ZSyvi3+H2IzRFs4lpgMPT/2C3phdSyi1ZrJvlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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