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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59686d4c2ddf66fb88ee866f7202eedf227888300bbb339a7f68ee48eb2715ba' 
  AND token = 'Kl6IgxaReot4MhWs6BGZ7pkGecxQc1GEzR1MvHr5v6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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