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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a46e1fdf5f7a06f7dfaa83b582cf7cec49f7df05ba0d8c05d38aea9e22473f4' 
  AND token = 'nu/4XWOw8BZZkRd+H5tpn1/LPvthlDiCDNewZrZHMAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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