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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0499c6fb5e691d81983b2ef08e98dba090e62263007986f4a9596a807b2f92d7' 
  AND token = 'QBjcleL6nLj2qQQwo00YrtAPWPtMK5/QoXnRPnADxdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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