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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9550b8ef29d8b95bd914aee37573100285b9042556bd201bb28c90174be1dbd' 
  AND token = '7OrTfuiCICZg+7/0fsy8cYJmSJ8gJaOByWg5kkGPv8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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