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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcfa73084557d4dede5b2726654a0f51c5f54bd7c871b70d855d433be3f5415' 
  AND token = 'GuINpe27J8+Q1NxyXLXMxJYlMzedCEILt6PjuJIjb4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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