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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940fc419b2ffdedd89803c71fc3380bd7ce39b5cfd59668af388e8953fb15226' 
  AND token = 'QWtvyI0XlMqq10LrNuW7+hdnQnZ8sOvd5R1GyPnXwD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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