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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ff46e7718a903a5314bf18b02b8d48ca06e1a623922af93b37c74b6a96eb0e' 
  AND token = '/k35DUMIfmrBZs6f8YKTv1AXVXCMqKjO0rHS01SWDiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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