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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcf071e7515ba3b4bfdf7f3b7dc54c350f3c376310ba63d37c8fdd8c489a8c9' 
  AND token = 'wjTG96VKmHbZmLUcQ++C3+xTPfQXynRNpiMAURuqyO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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