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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92264b83f2817baccddce06ff78207404ca58edc5d35d7baf60ae0105aaacf71' 
  AND token = 'l5Oab6r764C36BU+1L1nS0kQB/V4QnDypIdsrYpf4fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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