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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a47c093510e10944c429f1db4000efdde2b4256a4daee3c5a65c8c0aebcfbb6' 
  AND token = '+nTCkfBDZPtYwZHEhQ8QsoOhSXdtqoXe6fEzJ6Uq1Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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