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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fed65d4dfe4c98c641c8575ad2666bd250d538a06ac9569e98499081a32bab' 
  AND token = 'cyBkfKJk5Ij9hmYtp+bcdwekBN7YEMnsdCYTGt20Tmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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