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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c613c27918aacd9feafd98112c9b9b9406851450cb136e857b8e3d6c9973b967' 
  AND token = '4nuWqCg4XDcTrKsSEmD9Ym+Ng+G8yHDohgyyg6B48Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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