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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8f253a393e9f6c1a85c871a7e86696c23b25c4362411b1bf7dd8ad92b35229' 
  AND token = 'hZrWoMayNRvVkgRO52Ekq3Onwe8t0c0tC8gEUGgZVWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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