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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab5a0476b387e60eb443372e41a5d66a27cad31cb8464a14afef71733254028' 
  AND token = 'jbEMbCbJQRNLoplR8d8Auz8TChubuKtPDLr/mfbEhvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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