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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883e7a1b87fc118cdc57d7348f17b2d8dcf67ba5001127728e27b641f6bff140' 
  AND token = 'k2oleNTInyyjLfspOTb4iJX9aMsLGc792CVZgD3fUZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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