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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71311d47e90b12ef43fc05fd4bc6cbc5105bff12321e120426c598ea1d62d4d5' 
  AND token = 'HgmY97TP+EuvqwF4mqWI+YUUGqbyt0Lv4W72Y+v/E2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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