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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d88b34e45d9cd2ef013a1484db6ea3cf9be530a298eee9aa9ddaa059600c67' 
  AND token = 'AQQo/xdpBULNTzinI/XuYaltpf7C+KVy0WzUzXWDCmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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