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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e632fc7bef26322b2062f777926f72135d1911f1c8a14a5ba2d0c957ab346ea0' 
  AND token = 'rhLjRZwbM724K5lJ4NcWkL8Wm/g1ZhxFWuD5P8n2duo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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