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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d84bd7cc12fc1f033eaddeca06df47bd7ca8acff3e05ab95f7877cee15c266d' 
  AND token = 'mPQ+lT2vGXLx/okrBA7BWz9nfTNqS6X8+3hWRMofR6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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