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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a2a6ad0a3ab9e040416801ae3986b01a6fdc0b1f664a37ee67b39c30d8cf3e' 
  AND token = 'vLFCfsQDI3YZxBsvCC0+zT734nhb7cmVy5qqhG4+3lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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