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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6dcc72d17875e1e63ff8bb745d60b5ed81505e97546754bb0e64c6b2d505847' 
  AND token = 'aLn+TIrFPKdA75ULk7clWRH1dR3jRssOvRrKekm5Nvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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