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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87d8ac6ec7c2b537adabe902e83e5b43efbd78c51bc5fa1aac075ab326e586e' 
  AND token = 'dN6PSNYmTJ+uEOo4061txMl67DHc5OjrUO0YMUD+IYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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