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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac3c508dce60b21aab41b33515239a2fd285c215e0d917a0113d8257deb5a1b' 
  AND token = '4B547OQ1xFrPqv5IPZBg6Y2KoeQElCU21WqitDjJLmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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