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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0039cb0846e475d2b3db6e670fbc9fe7a933c689b5ec1a9e5869f70059c9f77b' 
  AND token = 'WYAft69ZaGAF0By++ouTBHd4xum69jBKC6YWalP5F3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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